[drupal-support] error 500 and menu module

[Larry]

I keepting getting eror 500 in the menu module. Any pointer to wht 
mmight be wrong welcome . I have reproduced the error below,

Server error!

The server encountered an internal error and was unable to complete
your request.

Error message:
Premature end of script headers: index.php

If you think this is a server error, please contact the webmaster.
Error 500

-
Larry